Physiological stress and recovery kinetics in trawl escapees of the Antarctic krill Euphausia superba Dana, 1850 (Euphausiacea)
When caught in a trawl, some individuals interacting with the fishing gear may escape, but such interactions may lead to physiological trauma that causes direct delayed mortality and/or increased vulnerability to predation. Understanding fishery-induced stress levels and the recovery period of escap...
Published in: | Journal of Crustacean Biology |
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Online Access: | https://orbit.dtu.dk/en/publications/5dd105c2-9724-4406-956e-0d3f6cd34ed0 https://doi.org/10.1093/jcbiol/ruab013 |
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ftdtupubl:oai:pure.atira.dk:publications/5dd105c2-9724-4406-956e-0d3f6cd34ed0 2023-05-15T13:53:49+02:00 Physiological stress and recovery kinetics in trawl escapees of the Antarctic krill Euphausia superba Dana, 1850 (Euphausiacea) Krag, Ludvig A. Krafft, Bjørn A. Herrmann, Bent Skov, Peter V. 2021 https://orbit.dtu.dk/en/publications/5dd105c2-9724-4406-956e-0d3f6cd34ed0 https://doi.org/10.1093/jcbiol/ruab013 eng eng info:eu-repo/semantics/closedAccess Krag , L A , Krafft , B A , Herrmann , B & Skov , P V 2021 , ' Physiological stress and recovery kinetics in trawl escapees of the Antarctic krill Euphausia superba Dana, 1850 (Euphausiacea) ' , Journal of Crustacean Biology , vol. 41 , no. 2 , ruab013 . https://doi.org/10.1093/jcbiol/ruab013 Escape mortality Krill fishery Lactate Pelagic trawl Stress clearance Stress response article 2021 ftdtupubl https://doi.org/10.1093/jcbiol/ruab013 2023-01-12T00:15:26Z When caught in a trawl, some individuals interacting with the fishing gear may escape, but such interactions may lead to physiological trauma that causes direct delayed mortality and/or increased vulnerability to predation. Understanding fishery-induced stress levels and the recovery period of escapees is therefore crucial for predicting total fishing-induced mortality. Hemolymph lactate concentration is commonly used as an index of physiological stress in many crustacean species, and the clearing time of lactate back to normal levels indicates the ability to recover from stress. We measured the hemolymph lactate concentration in three groups of Antarctic krill (Euphausia superbaDana, 1850): Group 1, trawl escapees collected during fishing; Group 2, specimens subjected to simulated mesh penetration; and Group 3, an onboard acclimated control group. Individuals that had escaped the trawl during fishing had the highest concentrations of hemolymph lactate (mean > 6 mmol –l ). Exposure to mesh penetration was in itself not stressful, as hemolymph lactate concentrations did not differ significantly between Group 2 and the control Group (mean 0.8 mmol –l versus 0.7 mmol –l , respectively). Additional stress factors during the capture and handling process likely added to the elevated lactate levels observed in Group 1. For the trawl escapees, the lactate clearance time during stress recovery was modeled as a function of exponential decay. Hemolymph lactate levels did not differ significantly among the three groups after 200 min, which suggested that Antarctic krill recovered from fishery-induced stress within this time period. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Euphausia superba Technical University of Denmark: DTU Orbit Antarctic The Antarctic Journal of Crustacean Biology 41 2 |
institution |
Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
topic |
Escape mortality Krill fishery Lactate Pelagic trawl Stress clearance Stress response |
spellingShingle |
Escape mortality Krill fishery Lactate Pelagic trawl Stress clearance Stress response Krag, Ludvig A. Krafft, Bjørn A. Herrmann, Bent Skov, Peter V. Physiological stress and recovery kinetics in trawl escapees of the Antarctic krill Euphausia superba Dana, 1850 (Euphausiacea) |
topic_facet |
Escape mortality Krill fishery Lactate Pelagic trawl Stress clearance Stress response |
description |
When caught in a trawl, some individuals interacting with the fishing gear may escape, but such interactions may lead to physiological trauma that causes direct delayed mortality and/or increased vulnerability to predation. Understanding fishery-induced stress levels and the recovery period of escapees is therefore crucial for predicting total fishing-induced mortality. Hemolymph lactate concentration is commonly used as an index of physiological stress in many crustacean species, and the clearing time of lactate back to normal levels indicates the ability to recover from stress. We measured the hemolymph lactate concentration in three groups of Antarctic krill (Euphausia superbaDana, 1850): Group 1, trawl escapees collected during fishing; Group 2, specimens subjected to simulated mesh penetration; and Group 3, an onboard acclimated control group. Individuals that had escaped the trawl during fishing had the highest concentrations of hemolymph lactate (mean > 6 mmol –l ). Exposure to mesh penetration was in itself not stressful, as hemolymph lactate concentrations did not differ significantly between Group 2 and the control Group (mean 0.8 mmol –l versus 0.7 mmol –l , respectively). Additional stress factors during the capture and handling process likely added to the elevated lactate levels observed in Group 1. For the trawl escapees, the lactate clearance time during stress recovery was modeled as a function of exponential decay. Hemolymph lactate levels did not differ significantly among the three groups after 200 min, which suggested that Antarctic krill recovered from fishery-induced stress within this time period. |
format |
Article in Journal/Newspaper |
author |
Krag, Ludvig A. Krafft, Bjørn A. Herrmann, Bent Skov, Peter V. |
author_facet |
Krag, Ludvig A. Krafft, Bjørn A. Herrmann, Bent Skov, Peter V. |
author_sort |
Krag, Ludvig A. |
title |
Physiological stress and recovery kinetics in trawl escapees of the Antarctic krill Euphausia superba Dana, 1850 (Euphausiacea) |
title_short |
Physiological stress and recovery kinetics in trawl escapees of the Antarctic krill Euphausia superba Dana, 1850 (Euphausiacea) |
title_full |
Physiological stress and recovery kinetics in trawl escapees of the Antarctic krill Euphausia superba Dana, 1850 (Euphausiacea) |
title_fullStr |
Physiological stress and recovery kinetics in trawl escapees of the Antarctic krill Euphausia superba Dana, 1850 (Euphausiacea) |
title_full_unstemmed |
Physiological stress and recovery kinetics in trawl escapees of the Antarctic krill Euphausia superba Dana, 1850 (Euphausiacea) |
title_sort |
physiological stress and recovery kinetics in trawl escapees of the antarctic krill euphausia superba dana, 1850 (euphausiacea) |
publishDate |
2021 |
url |
https://orbit.dtu.dk/en/publications/5dd105c2-9724-4406-956e-0d3f6cd34ed0 https://doi.org/10.1093/jcbiol/ruab013 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Antarctic Krill Euphausia superba |
genre_facet |
Antarc* Antarctic Antarctic Krill Euphausia superba |
op_source |
Krag , L A , Krafft , B A , Herrmann , B & Skov , P V 2021 , ' Physiological stress and recovery kinetics in trawl escapees of the Antarctic krill Euphausia superba Dana, 1850 (Euphausiacea) ' , Journal of Crustacean Biology , vol. 41 , no. 2 , ruab013 . https://doi.org/10.1093/jcbiol/ruab013 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1093/jcbiol/ruab013 |
container_title |
Journal of Crustacean Biology |
container_volume |
41 |
container_issue |
2 |
_version_ |
1766259280120381440 |